Polished plate-glass lens.



E. LUCKE.

POLISHED PLATE GLASS LENS.

APPLICATION FlLED APR. l19. 1916. 1,2090?, Patented De@.19,1916.

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E. LUCKE.

POLISHED PLATE GLASS LENS.

APPLICATION FILED APR.19. 1916.

Patented Dec. 19, 1916.`

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Specication of Letters Patent.

Patented nec. ia, raie.

. Application led April 19, 1916. Serial No. 92,147.

To all whom t may concern:

Be it known that I, EMIL LUCKE, residing at Portland, in the county of Multnof mah and State of Oregon, have invented certain new and useful Improvements in Polished Plate-Glass Lenses, of which the following is a specification.

My invention relates to improvements in polished plate glass lenses for automobile lights and the same has been particularly designed for use as a dimmer to prevent the rays oflight emanating from thel lamp from blinding pedestrians or others approaching from in front and to-this end the invention resides in providing the lens with an upper semi-circle of ground glass and a dependingr central tab of ground glass to cut oil' direct transmission of the light from the bulb or illuminant, the lower half of the lens being of transparent glass and provided with miter cuts for dispersion purposes.

The invention also resides in those novel features of construction hereinafter fully described and pointed out in the appended claims, reference being had to the accompanying drawings, in which:

Figure 1 is a front or face view of a lens constructed in accordance with the invention. Fig. 2 is a vertical section on the line 2--2 of Fig. 1. Fig. 3 is a horizontal section on the line 3 3. of5 Fig. l. Fig. 4 isa view similar to Fig. 1 of a slight modification. Fig. 5 is a cross section on the line 5-5 of Fig. 4. Fig. 6 is a face view of a further modilication. Fig. 7 is a horizontal section on the line 7-7 of Fig. 6. Fig. 8 is a vertical section on the line 8--8 of Fig. 6.

In the drawing, in which like numerals and letters of reference indicate like parts in all of the figures, the lens 6 is preferably of the convex type and is provided with a rim or flange portion 7 lhaving notches 5 at intervals, by means of which the lens can be fixedly located in place. The upper half of the lens is ground to form a surface 1 that merges with a depending semi-circular ground surface 2 in the form of a tab to prevent direct passage of the rays from the light .source or bulb. The lower half of the lenses is clear, as at 3, and is provided with suitably arranged vertical miter cuts 4 to increase the light on the ground, by dispersion.

In the forms shown in Figs. 4 and 5, the tab 2 is of transparent glass and the miter cuts 4. are on the inner side of the glass instead of on the outer side as in the forms shown in Figs. 1 and 2. As in the form shown in Figs. 6, 7 and 8, the ground portion of the glass may be the lower half and the miter out clear portion on the upper half of the lenses. I desire it understood that in either form of the invention the lenses may be used with the ground portion down and the clear portion up or the clear portion down and the ground portion up, as may be found desirable. and depending upon whether or not the lamp is a gas lamp or an electric lamp, and depending upon the nature of the reflectors within the lamp.

From the foregoing description, taken in connection with the accompanying drawing. it is thought the complete construction and advantages of my invention will be readily understood by those skilled in the art to which the invention relates.

What I claim is 1. A lens, the upper half of which is ground and provided with a' tab portion at the center also of ground surface, the lowerhalf, except the tab, being clear and provided with vertically extending parallel miter cuts.

2. A lens comprising a plate, one-half of which is ground and the other half clear, the clear half being provided with parallel light distributing miter cuts.

3. A lens, the upper half of which is ground and provided with a tab portion at the center also of ground surface, the lower half, except the tab, being clear and provided with vertically extending parallel miter cuts, said lens also including an anlnular rim portion having notches substantially as shown and forA the purposes described.

4. A lens comprising a body, a portion and the remaining part of said body being of which is ground an the remaining por- Provided with parallel vertically extended tion is provided with alternating clear suright distributing undulations or grooves. 10

faces and parallel light distributlng grooves. EMIL LUOKE. 5 5. A lens comprisingv a sheet glass body Witnesses: f

approximately one-hal of which is ground M. FREEMAN,

to form a continuous translucent portion, A. T. LEWIS. 

